frequency op• Data kinds: image → image
• Call: fullseye.apply(img, "phase_deg", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: phase_deg (the HALCON reference is a useful guide to its meaning and parameters)
*The figure is the real output on a synthetic 128×128 input. Left: input, right: output (a non-image return value is shown as the value itself).*
A phase-angle map of a complex image. Linearly maps `np.angle(F) (-pi to pi) to [0,1] via (angle+pi)/(2*pi)`. a and b are unused.
> The detailed description below is the original text — the summary and the headings are translated.
名称は「度（degree）」を示唆するが、実装は phase_rad と同じ `_sh_freq の fft_phase 分岐を共有しており、度数法への変換は行っていない —— 返るのは [0,1] に正規化された角度で、実際の度数（0-360°）ではない。HALCON の phase_deg`（複素画像の位相を度単位で返す演算）の代役としては単位が違う近似である点に注意。
• gallery2d_texture_freq family guide
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.
phase_deg 0.40 0.50
▸ Load this pipeline · Load & run
• gallery2d_texture_freq — py -3.11 examples/gallery2d_texture_freq.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
frequency)lowpass · highpass · sk_butterworth · fft_image · power_real · power_byte · phase_rad · highpass_image
*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.